PaulG
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Posts posted by PaulG
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Hello All
I have a moth balled Lister Letter LPW3.
I've a Polar End Cap a3-783 fitting to LPW3. Gone through a couple when I used to use the engine...absolute rubbish.
The cap seemed to end up with an air lock and steam that melted the thing along its seam..no matter what I did to rid it of the air lock.
I have read on various forums that it's a common problem..and fitting a Bowman 2679np may be an alternative.
Is that correct?? Anyone done this and found it satisfactory???
My halfway fix back in the day when I used the LPW3(from pre internet days!) was to fit a small expansion tank (out of a peugeot 205 I think) higher than the engine and connected to the spout of the radiator cap drain..and leave the cap off the header tank.. (No pressure no splitting of the end cap..).and about an extra half litre of water that expands and contracts into and out of the header tank as the engine goes about its day..
I thought a cost effective solution considering the end caps costed close to 40 quid.
..but it would be good to have a proper solution....
I have the same engine fitted with the same Polar endcap, and I have had similar problems.
When I bought the boat there was a spare cap on board, and I soon found out why. I was going through two a season, and sod's law being what it is, they usually go at the most inconvenient times...
For reasons that I've never entirely worked out, my engine looses a bit of coolant. I think the previous owner had tried to stop this by fitting a 13 psi (AFAIR) pressure cap.
Since I replaced this with a 7 PSI cap I have not had any problems.
I do need to top up with coolant regularly, though.
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Let's hope that the investigation upholds the proper protection for the disabled, elderly, sick/pregnant but throws out the nonsense that simply "having children" should also attract some sort of exceptional treatment.
Indeed.
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Post all screwed up - mods please delete!
OK, I'm not a ship designer and complicated maths is way beyond me but why doesn't that Maersk container ship just roll over? And why don't all the containers fall off? years ago I used to rope and sheet lorries and if I loaded that great big thing I would use miles and miles of rope but I can't see even a piece of string holding that lot on. Perhaps that's why my LED lamps from China never arrived, the container fell off.
They don't roll over because there is a lot of ship underwater that you can't see.
Containers are carried in the hold as well - the ones you can see are just the deck cargo, which makes the ship look top-heavy.
By brother-in-law was skipper of a panamax-sized container ship for quite a few years, and they had computer programs to work out the loading order and the weight distribution so that the ship was stable and trimmed correctly.
If memory serves me right, his ship (s) carried containers eight deep in the holds and in stacks of five high on deck
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Hello there,
I recently replaced batteties as I was getting a very inconsistent volatage to the 12volt mains interior. They were 3 years plus old and I live aboard so It made sense a bit.
Turns out It was not that, when I take a reading from the mains, fine, 13 volts plus. but when I plug an appliance in, such as a laptop adaptor or tv the voltage drops considerably.
Any ideas anyone please?
The lighting is fine, bulbs nice and bright, I checked polarity of the socket and someone said the Isolater, whatever that Is was OK.
It might be a job for an Electrician possibly, does anyone know of one In the Bradford upon Avon area?
Kind regards,
Nick.
Where are you measuring the voltage?
Close to the batteries or close to the appliance you have plugged in?
If it's the latter, as Mike says above, it's probably poor cabling
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I agree. If there's any "fresh" in the river, then it is better going downstream from Stourport.
Obviously it will take some time to get from Overwater to Stourport, and conditions on the Severn can change pretty quickly, so I'd suggest going this way round, just in case.
As others have said, Tardebigge is much the same in either direction, not much in it really.
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For those interested of real world tests, http://flexofold.com/upload_dir/docs/Test_YachtingMonthly_low.pdf
we can see that the standard fixed blade fixed pitch propeller did go 7.5 kts, the fastest was the flexofold with 7.65 so the std prop was probably not optimal.
having 94% Thrust HP (shaft HP * efficiency)
The moixa doing 7.1 kts having 84,8% THP of the Std. and 79,9% THP of the best of the tested.
In the forward bollard pull test. (2.6:1 gear ratio)
the flexofold and Std pulled 270 and 264 kg, std doing 98% of flexofold
the moixa 213 kg 80,7 -78,9% of the std and flexofold
In reverse (3.0:1 gear ratio)
the Moixa pulled 181 kg and the standard 173 kg, here the moixa was 4,6% better.
so 4.6% better in astern pull test, but the std was 23,9% better in forward pull.
SO, the std 3 blade don't lost to much in reverse, but the gain in forward is large, and how much time is spent in reverse compered to forward?
The Axiom had the shortest stopping time from 6 kts
Interesting.
My interpretation of the test results is that the Axiom works better in reverse, which is what you might expect given the symmetrical nature of the design.
However, this appears to be at the expense of forward performance.
In the "bollard pull" test, the standard 38 prop gave a pull of 264 Kg, and the Axiom was 57 Kg less, at 213 Kg.
A quck calculation that I ususally get wrong tells me that's about 22% less power.
This is seen in the speed tests, where the standard 38 prop produced 7.5 knots and the Axiom 7.10.
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Sounds as if this person was lucky he wasn't in court on manslaughter charges.
"The boat has been advertised on AirBnB and can accommodate up to ten tenants. A BBC mini-documentary screened earlier this year, with a reporter and insurance expert staying aboard for a night, showed something of the interior of the boat and the state of its toilets. The expert described the vessel as a fire trap."
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Looks like a medium skewed propeller, but not just the planform will be wrong in reverse, the airfoil will be wrong too.
so an airfoil with two high camber leading edges will make it equal both ways, it's like having 50% water in a single malt
A heinous crime!
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Treacle down chimney is normal - you get less with smokeless fuel. Should have a double skinned chimbley, mine still needs an extra rolled up aluminiumumum tube wedged in it to make sure the treacle goes back into the fire rather down side of tub. It will also block up the bottom of the flue at the fire end if you've got a damper plate installed - I took mine out.
PS don't put the treacle on toast. Even Marmite's nicer.
I'm tempted to ask how you know that...
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read that most normal props is 50% efficient in reverse of the forward efficiency, and that most props is 50-60% efficient in forward at design point.
If the prop blade is assymetric, like this one:
Then it is optimised for forward efficiency.
When it is in reverse, it is turning in the opposite direction, so the effective shape is "backwards" for best efficiency.
Of course, boats spend the majority of their time travelling forwards, so this type of design is popular.
Designs like the "Axiom" look to be symetrical, so should be equally efficient when operating in either direction.
However, for the short periods of reversing, I can't see that reverse efficiency really counts for a lot unless the boat is underpowered. If the prop is inefficient, then just give it more revs.
Extra revs *may* cause more prop walk, however.
But, as in the case of Mr. Brunel, you'd need to test two identical boats side-by-side without knowing which props are fitted to see if there is any difference in reality.
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I'm sure it would have been a double blind test...
Naturally...
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No, that is what they have specified to match the Crowther. The Crowther was tested in their test pool and showed as more efficient than most normal shape propellor going forwards, but only 15% efficient in reverse.
The owner is hanging on to the old prop for now....in case axiom aren't quite right....
Not exactly an independent test then...
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I've said it before but it is very interesting that an Axiom supplied now looks entirely different to what they looked like when first launched.
Rather clever of them to have come up with the perfect design, only to apparently completely scrap it, and come up with an entirely different perfect design.
Any propellor design is a compromise. If you improve one aspect of it's performance, then it will often be to the detriment of another.
Propellor design has been studied in great detail, and over a very long period. Even in the very early days, Brunel was responsible for two years of tests between 1843 and 1845 using HMS Rattler and other vessels.
Since then, designs have been developed for many specialised applications e.g. submarines (primarily for quiet running), large merchant vessels (primarily for efficiency).
In more recent years, powerful computing systems have been developed to produce optimised designs.
Axiom claim that their design is beneficial for "Suitable for most types of vessel - fast or slow, displacement or semi displacement".
So Axiom claim to have come up with a kind of "universal design" that over 100 years of research by heavy hitters like the Admiralty has missed.
Personally I do not believe it.
There's a discussion of ship propellor design here:
and in more detail here:
http://marine.man.eu/docs/librariesprovider6/propeller-aftship/hydrodynamics.pdf?sfvrsn=2
There are blade profiles in the second document that appear very similar to the Axiom one...
Yes, they are large ship propellors, but the performance must be proportional to size or they would not be tested on models.
I am not suggesting that their design is not a good one - it may be perfectly sound, but I don't believe their "all things to all men" claims.
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I'll give him 50p for the old Axiom...
Excessive, IMHO.
The boat opposite me has an Axiom. The owner says that they spend a lot of time down the weed hatch...
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According to the Dark Side the canals through Dublin have been closed due to vandalism and outright attacks on boaters
If true, that's a shame.
The Royal Canal was on my "bucket list"...
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Weve just purchased our 1st boat ...a 50 foot narrowboat which we'll moor in Newbury. What we lack in experience we'll make up for in an enthusiasm to learn and i am sure this forum will be a great source of information. Can anyone recommend which publications and maps we should purchase as a basic starter pack? Eg A detailed waterways map of the UK, I have geard Nicholsons guides mentioned often. Is there such a book as a beginers guide to narrowboating? Anything that covers the mechanical or technical aspect of narrowboat ownership would also be useful.
This book was very useful to me when I first bought my boat. (Other books / vendors available!)
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I really have to attend to some issues of my own having nowt to do with CaRT, but for now, one significant issue from those Leigh is bringing [and it is closest to his heart] is failure to abide by legislation protecting the common man from disproportionate excesses in recovering debts and/or punishing breaches of law. This is altogether independent of whether he needed a pleasure boat certificate or not.
CaRT finally and very belatedly admitted in pleadings that s.8 is NOT available for the exercise of a lien respecting debt. Their consequent argument that this does not matter is bewildering. Successive Parliaments over the centuries have fenced powers to recover debt with protections to ensure that due process is followed according to strict procedures and court authority.What Leigh’s case has already highlighted, is that BW/CaRT have, directly contrary to law [as they now publicly acknowledge] been applying s.8 powers for the last 8 years at least, as the inappropriate and unlawful tool for the extraction of payment for debts, bypassing the mandatory court procedures.Since the publication of the latest judgment in Leigh’s case, ensuring that I will be able to assist him, and following onionbargee’s direct reference to the CaRT pleadings in demanding a re-write of the “Licence it or Lose it” webpage, that page has now been altered to exclude the wording wherein the institutional policy to act criminally has been proclaimed for the last 8 years at least.It hopefully follows from all this, even in advance of next year’s hearing, that CaRT will finally understand just how inappropriate s.8 is, for the enforcement of licences. Everyone should note that this does NOT remove a power from CaRT for enforcement of the licence requirement – indeed, it will force CaRT to begin using instead, the appropriate and specifically endowed powers that they were given for precisely that purpose.My opinion is that we have no need whatsoever for a “better legislative basis”; what we do have need of, is for CaRT to be headed by people of integrity, replacing the present contingent with personnel determined to operate lawfully under the efficient powers already available. It is a matter of practicality and monetary efficiency, even apart from the present moral and legal desuetude.CRT still have this page up:
https://canalrivertrust.org.uk/enjoy-the-waterways/boating/licensing-your-boat/licence-it-or-lose-it
For those that don't like following links:
"Our main tool for enforcement is the power for the Canal & River Trust to 'section 8' unlicensed boats. This relates to powers given in the British Waterways Act 1983 (and transferred to the Canal & River Trust) and allows us to remove boats from the waterway if they are there without our permission or persistently in breach of our licence terms and conditions – including not having a licence."
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Nothing wrong with setting locks in advance BUT...please look ahead.
Some 'skippers' seem to send a team ahead with instructions without telling them the whole story.
Anyway, rant over. You know who you are.
This tactic doesn't always work in their favour.
A couple of years ago, we were going up the Tibberton flight on the W&B and just exiting the top lock , when a load of lads (armed wtih tins of beer and windlasses) came jogging down the towpath followed at some distance by a hireboat.
"How far is it to Worcester? We're trying to get there before closing time" they panted as they hurriedly closed the top gate and proceeded to pull the paddles .
I tried to point out that draining a lock that was already set for them was hardly going to speed their progress, but this fell on deaf ears.
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Threat of eviction very real. Some boaters paid up a year in advance to unscrupulous landlord. Dont sign if you don't want to. It's people's homes. A Victorian boatyard round the park that has historical and local significance as well as being the last boatyard upriver on the Medway. A shame to concrete it over for flats. It's seems unlikely flats will go ahead but boaters still caught up in a legal battle with no other moorings nearby some will lose jobs. Local support and MPs support. Do what you can. Thanks everyone
I know nothing about the situation that you are in. Personally I think you need to explain the circumstances a bit better.
It seems to me (from the limited information available) that the land owner was a victim of the "unscrupulous landlord" as well as you.
The land owner says that he seeks to make a new agreement with you. I'm failing to see any threat there. If he is making unreasonable demands, then of course that is different.
I think people on this forum are very willing to support worthy causes. But giving next to no information and then saying "Don't sign if you don't want to" is not going to achieve much in the way of results, IMHO.
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Has anyone won a case against CRT?
0r has CRT losed a case, or gave up.
It seems that if you have a watertight case against CRT, you need buckets of money because then legal team for CRT will play with you till you can't afford to fight anymore. Knowing it's our own (not theirs) money their fighting you with
Am I right, or have I missed a chunk of news so where?
I think you will find that Mr. Moore did.
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I too am sceptical - many of the 'boating stories' that the 38 Degrees have been involved in seem to be very controversial and the 'other side of the story' is more than relevant.
Lets hear both sides, and then vote as 'informed' individuals rather than just jumping on the bandwagon because it has 'boat' in the title.
Apparently the boatyard is "Tonbridge's Answer to Venice"...
Of course, there remains the slight possibility that this description is over-egging reality.
Edited to say that, having read the letter from the landowner that is pictured in the article, his terms appear to prevent squatting on his land, whichon the face of it seems to be not unreasonable.
Of course, there may be other correspondence that has not been published.
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If I could moor for as long as I liked at Merry Hill, it would still be less than 10 minutes.
Really?
If you moor opposite Wetherspoons you can use their free wifi on your boat...
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Found it:
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Why is that then? Is the Lancaster landlocked or something? I can't find it on my map.
It was isolated once, but now connected by the "Ribble Link".
Here it is:
https://canalrivertrust.org.uk/enjoy-the-waterways/canal-and-river-network/ribble-link
Polar End Cap softening and then splitting under pressure and heat
in Boat Building & Maintenance
Posted
Hi Frank,
The header tank on my boat isn't pressurised. I suppose technically it isn't a header tank, it's just an overflow tank.
The pressure cap is mounted on the heat exchanger, with a hose going up the the tank.
I have often wondered whether it's worthwhile fitting a pressurised tank..
For the moment I've decided that if it ain't broke I'm not going to fix it.